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As far as time travelling spaceships (ie that go back to prehistoric times and fight the dinosaurs), it's not going to happen. If it were possible, it's not like this reality will continue to exist until someone goes back in time and messes it up; if they've gone back in time, it's happened, and this reality is the result. The past (and the future, if you ask me) is set in stone, just as much as matter and energy are set in stone (I mean you can't just make them appear/disappear).
I think it is true that nothing can be created nor destroyed, but it sure can be manipulated as much as we want though, thus the expression of 'mind over matter'. That has been proven years ago in physics anyway; just the fact of observing matter modifies its particularities. The observer and the observed are in some way one and the same.
As far as Norad's question about objects or phenomenons going faster than the speed of light, I can't be sure if this is what you are talking about but could you mean Higg's boson or what is also known as the God particle ?
There is also another subatomic particle that has been under study for years, the holographic particle. In the '80's, a French scientist Alain Aspect did some experiments which confirmed that under certain circumstances, these subatomic particles can communicate instantaneously whether they are a few feet apart or millions of light years away. Affect one and the other changes simultaneously...distance no longer has any importance where those particles are concerned.
According to the special theory of relativity (keep in mind that it is a theory still and not proven to be a law yet) time is dependant on speed, as is mass and length. Basically, the faster you go, time slows down, length contracts, and mass increases, to an outside observer. At the speed of light, time stops, length=0 and mass becomes infinite. This is why Einstien believed it was impossible to reach the speed of light. Yet photons, the particles that make up light (if you want to think of light as a particle and not a wave) travel at the speed of light, by deffinition their speed IS the speed of light. I have heard of other particles that can travel faster than the speed of light, but i can't remember what they are.
As far as that NASA experiment with the clocks and the the space shuttle, impossible. the time dialation effects depend on the speed that you are going, relative to the speed of light, and the time you are traveling at that speed. the speed of light is, if i remember correctly, 300 000 000 m/s. The space shuttle when traveling in orbit goes around at about 10 000 m/s, or about 1/30 000 of the speed of light. In order to get only a couple seconds worth or 'time travel', you would need to go at that speed for years, perhaps decades or even centuries. to get a few hours, thousands of years.
Science aside, if i could travel through time, i think i would either go back to important battles, as someone already stated, D-day perhaps. Or i would go forward and see what will happened to us in say 100 or 1000 years.
We already can travel back in time- through books. Haha.
Now I know where I went wrong with the clocks on the shuttle craft and on the ground.
It wasn't the shuttle craft, nor was it anything to do with time. It was the importance of an experiment conducted in 1962 where using a pair of accurate clocks mounted on a water tower. The importance? The difference in the speed of the clocks at different heights above the earth. Because of accurate navigation systems based on satellite signals, if the prediction of general relativity was ignored, the position that one calculated would be off by several miles.
Steven Hawking A Brief History of Time.
Sorry 'bout that dgthe3. Not my purpose to spread BS.
I'd like to experiance the War of 1812 or the Battle of the Plains of Abraham.
It would still be worth shit becuase our coins aren't made from gold or silver.
They weren't even made of any kind of metal. We did use to have a 25 cent bill ya know.
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If we could bring back things, like rifles or things, I'd assassinate Adolf Hitler during WWI.